Improving Students’ Conceptual Knowledge in General Chemistry Using Desire2Learn Joann Pfeiffer Century College (Twin Cities, MN)
Project Goal: Have students take a “quiz” in D2L for each topic covered in General Chemistry. Motivation: • Students need to test themselves on conceptual understanding, not just on problems. • The quiz tool in D2L provides an effective and efficient means for providing students with lots of questions.
“Quiz” Set-Up • 10 multiple choice questions randomly selected from a question library • Unlimited number of attempts allowed • Highest attempt automatically recorded in the D2L gradebook • Quiz questions with answers provided immediately after submission • No time limit on the “quiz”; completion required before exam on the material • Focus of questions is on conceptual knowledge
Example Questions 1. For the reaction A = B, the rate law is Rate = k[A]. What are the units of the rate constant where time is measured in seconds? a) M-1s-1 b) Ms c) s/M d) M2/s e) s-1 2. What determines the exponents in a rate law? i. experimentation ii. the coefficients in the balanced equation iii. the concentrations of the reactants a) i only b) ii only c) iii only d) i and ii e) ii and iii
Examples 3. In general, as the temperature increases, the rate of a chemical reaction a) decreases due to fewer collisions with proper molecular orientation. b) decreases for endothermic reactions. c) decreases for exothermic reactions. d) increases due a greater number of effective collisions. e) increases due to a lowering of activation energy.
Time-Saving Tip Respondus .rtf (Rich Text File) [Word] .xml File [D2L] www.respondus.com
Topics for Gen Chem II Quiz Topic (points)Number of Questions Kinetics (10) 34 Equilibrium 1 (5) 43 Equilibrium 2 (5) 17 Acid/Base (10) 42 Oxidation/Reduction (10) 41 Thermodynamics (10) 44 Solids (10) 28 Naming (10) 27 VSEPR (10) 36 Electron Configuration (10) 27 Quantum (10) 23
Summary of Results for Gen Chem II • Most students took each quiz until they got the maximum value possible • On average, each student took the quiz 4-5 times • 20% of the students in section 1 and 6% in section 2 took a quiz after earning the maximum value possible • 43% of the students in section 1 and 24% in section 2 took quizzes that weren’t graded as a review for the final
Topics for Gen Chem I Quiz Topics (points)Number of Questions Intro/Sig Figs 43 Atoms/mass 51 Naming inorganics 81 Rxns in aq soln 49 Quantum 51 Electron Configuration (5) 40 Periodic Properties (5) 22 Lewis Dot / VSEPR 72 Thermochem 38 Gases 65 Intermolecular Forces 37
Summary of Results for Gen Chem I • Most students took each quiz until they got the maximum value possible • On average, each student took the quiz 4.2 times • 8.6% of the students took a quiz after earning the maximum value possible • 14% of the students took quizzes that weren’t graded as a review for the final
Student Opinions – Gen Chem I On a scale from 1=strongly disagree to 5=strongly agree The D2L quizzes were useful when studying the material for the course 4.12 I find the study guides for the exams useful 4.12 I liked working in groups on the activities in discussion sections (POGIL) 3.46 I used my textbook often when studying the material for this course 2.79 I used the CD-ROM disks that came with the text often. 1.76
Acknowledgements Dr Larry Litecky, President of Century College Center for Teaching and Learning at Century College Thank You